Platen printing press



Fb.'4, 1930. M. HORA 1,745,930

PLAIEN PRINTING PRESS.

Filed July 18, 1927 6 Sheets-Sheet 1 o 80 .14 0 co O 85 19 o 2 a Q 5 31 I q {30 L I O O o v 3 J 0 0 o hue/2702': Max Mora WMW Feb. 4, 1930. M. HORA -PLAIEN PRINTING PRESS Filed July 18, 1927 a Sheets-Sheet 2 1002/7/01: b7 fl ra...

F613. 4, 1930. HORA v 1,745,930

PLATEN PRINTING PRESS Filed July 18, 1927 6 Sheets-Sheet 3 Feb. 4, 1930. M. HORA 1,745,930

PLATEN PRINTING PRESS Filed July 18, 1927 '6 Sheets-Sheet 4 .7/70877/01'." 77lfi m a Feb. 4, 1930. M, Q

PLATENPRINTING mass 6 Sheets-Sheet, L5

Feb. 4, 1930. M, HORA I 1,745,930

PLATEN PRINTING PRESS Filed July 18, 1927 6 Sheets-Sheet 6 rllllllE Patented Feb. 4, 1930 IFU I P Y MAX irormgion D SsEL ORF- BERKAsSEL, en emAnx Assmiioa TO THE FIRM EISEN- PATENT- orms" -WERK UND MASCT-IINENBAU AKTIENGESELLSCHAFT, OF DUSSELDOBF-HEERDT,

G rERMANi PLATEN PRINTING PRESS Application filed .luly 18, 1927, Serial No. 206,704, and in Germany July :21, 1926.

This invention relates to improvements in platen printing presses, and in particular to presses in which the platen reciprocates upon a fiat track. In order to enable laying in and out to be effected quickly in platen presses of 7 this kind, the arrangement is made according to the present invention that grippers fitted to chains circulate round the platen in such a manner-that they move alternatelyin a di motion in which they take the sheet OK the laying-on table and placeit in marks on the platen, then move in the opposite direction on to the sheet for the purpose of seizing it,- and then move'in' the original direction again for the purpose of laying out the sheet. This alternating movement isproducedi by means of a novel driving mechanism for the chains of the grippers. V p

The grippers take the'paper off a laying-n table which swings upwards each time, when a gripper moves through under it, and which swings downwards when a gripper moves on to it.- V

The sheets may be placed upon this table by hand, but for the purpose of quick laying on,"an automatic pneumatic deviceis provided, which is connected with a device which raisesthe piling table upon which the sheets are "stored according as the sheets are used up; 1 This device is controlled by a feeler armnvl ich comes into contact with the uppermost sheet. a Y f v 2 The platen press is furthermore also pro- 7 videdwith a novelslide-way for the platen,

' a Figure press as a whole; Y

' Figure 2 1s a side elevation of the platen and of'the gripper device in various positions, and of the device for driving the pp r Y i Figure 3a plan of the device for driving the-gr ppers; c.

Figures 6,17, Sand 9 show'the position of the grippers in the various successive posi-' tions of the platen'shownin F igure2; Figure 10 shows the guide for the 'laten; Figure 11 the same on a larger scale; Figure '12 is a general view in perspective of the laying -on table;

1 Figure 13 a side elevation of the laying-on plate in a lowered position; Y 3 Figure 14 aside elevation of the same in a raised position q 7 r Y Figure 15 .a plan of the laying-on plate; Figure 16 a side'ele'vation' of the laying-on marks of the laying-on plate on a larger scale; Figure 17 a side elevation of the device'for rocking the laying-on plate and fortransferring the sheets thereto, and of the device for raising" the piling table; a

Figure 18 the sam device seen from the" on both sides supports 5, the lower ends 6 of which are'constructed as three-sided prisms. With these it runs in accurately fitting V-shaped channels 7 (Figures 10 and 11'),

which are cut in the base ofgrooves 8 inrails Y 9, which prevent the lubricating oil from overflowing. On to the surface 10, which is left on the outside of the press beside the groovesS, is screwed a rail 11, whichengages in a groove 12 cutin the support 5, and bears upon the under side of the groove 12' so as to V lock the support:5. The prism 6 is thus positively guidedfbetween the "frail 11? and the channel 6. I u In order to enable the positive guide to be adjusted for wear of the prism 6 and of the o channel- 7 the height of thesurface 10 is'so dimensioned as to leave between it and the rail 11 a gap, whichisfille'd upby a number of very thin sheet-iron strips, not'shown, of about from 0.1 to 0.2 millimetre in thick ness. When an inadmissible amount of clearance space arises, owing to wear-of the sliding pletely opened.v

surfaces, betweenthe rail 11 and the prism 6, one or more strips are taken away from below the rail 11 until the clearance space is equalized.

On each side of the platen 2 an endless chain 17 is passed round chain wheels 13, 14, 15 and 16, and upon each of these chains is arranged at two positions a number of grippers 18 and 19. The movable, limbs, of the.

grippers are mounted upon a shaft 20 and are normally kept closed by a spring 21 coiled round the shaft, and only opened when a pawl 22 fitted to the end of the shaft 20 passes over a cam 38 fixed at the position inquestion. In bearings 23 which are interposed in the chains. 17 is journalled a shaft 24. The gripper shaft 20 is carried by arms 25 Which are rigidly mounted upon the shaft 24. A spring 26 coiled round the shaft 24 tends to rock the grippers into the position shown in dotted lines in Figure 5, but is prevented from doing so by a pawl 27, which engages in a recess in a collar 28 on the shaft 24.

To the shaft of the chain wheels 16 is slidably keyed a toothed wheel 29, the diameter of which is smaller than that of the chain wheels. The toothed wheel 29 moves in a frame 30, which is provided internally at the top and bottom with toothed racks 31 and 32. These engage one over the other in the manner illustrated in Figure 3, so that each rack occupies in the central part of the frame about half its breadth, and towards the end of the frame the whole of its breadth, and

that where one rack occupies the whole breadth of the frame the other is entirely absent. Furthermore at the two ends of the frame 30 are arranged triangular cams 33 and 34, which push the toothed wheel 29 over into the widened part of the corresponding rack.

I Vhen'the platen 2 moves out of the print ing position, shown in Figures 1 and 6, towards the right, the toothed Wheel 29, mounted at the. right-hand. end of its shaft, first runs in the wide part of the lower rack 32, and the chain 17 moves in the direction of the arrow 00 in Figure 2. This however only continues until the toothed wheel 29 has reached the position marked a in Figure 2, in which the lower rack 32 comes to an end on the righthand' side of the frame 30, and in which the toothed wheel 29 comes into engagement with the upper rack 31, as shown in Fig. 7. The toothed wheel 29 then reverses its direction of rotation and the chain moves in the direction of the arrow y, until the platen is com- Upon the reversal of the platen the toothed wheel 29, which still meshes with theupper rack 31, again reverses its direction of movement, and the chain' moves first in the direction of the arrow 00 (Fig. 8) until the toothed wheel enters at 6 into the lower rack 32,-whereupon the further movement ofthe chain then proceeds in the direction of the arrow y, until the platen has reached the printing position. Hence the result is that the endless chain 17, irrespectively of whether the platen is moving forward or backward, moves preferably in the direction 3 and only executes at the commencement of the opening and of the closing of the platen 2 a short backward movement each 6-9 inclusive. The corresponding positionsof the platen are denoted in Figure 2 by V VI, VII and VIII respectively.

.During the printing, the gripper 18 stands underneath the platen 2 in the neighbourhood Of the register platev 36, and the gripper 19 above the platen in the neighbourhood of the rear side thereof. When the platen 2 begins its rearward movement of the forme 4, the grippers,so long as the toothedwheel 29 is in mesh with the rack 32,-move in the direction as, and the gripper 18 seizes the lower edge of the sheet located on the platen. Forthis purpose it is opened as it approaches the sheet owing to the pawl 22 sliding over the cam 38*. After the pawl 22 has passed over the cam 38 the gripper again closes andin doing So seizes the sheet held between the marks moves in the direction a: to the register plate 36, its pawl 27 strikesagainst the cam 38 and is thereby rocked in the anticlockwise direction (shown in Figure 5 in dotted lines). By this means, the pawl 27 comes out of engagement with the ring 28, whereby the gripper shaft-20, under the force of the spring 26 as indicated in Figure 5 with dot and dash lines, swings away from the register plate 36 until a projection 39 on the ring 28 strikes against a stop 40 on the bearing 23. The grippers hereby swingso far away from the register plate 36 that the sheet, during its return movement, which now takes place, is lifted over the laying-on marks 41. As during its downward movement, the gripper is situated in the position shown in dot and dash lines in Figure 5, the pawl 22v does not strike against the cam 38 so that the; gripper remains closed and holds the sheet securely. The position of the cam 38 on the platen is so dimensioned that in the case, of smaller shown in Fig. 8.

sizes of paper the laying-onmarks 41 can be fitted higher up than is shown in Figure2, so that the printing is always effected in the centre of the platen. Since the .grippers, owing to the swinging out, pass out of reach of the cam 88?, by which they were opened when moving forwardythey remain closed during the return movement, which now takes place in the direction of the arrow y. Their return is occasioned by the fact that the toothed wheel 29 now passes out of the widened part of the lowerrack32, into the rack 31, and reverses its direction of rotation. The gripper 18 takes with it the sheet that it 'has'seized-and brings it over a depositing table or turning rake 43, upon which it lets it fall as soon as its pawl 22 passes overa cam 44 mounted on the chain wheel 16, as

The gripper at thismoment is still'situated in the position shown in dotted lines in Figure 5. During the further movement of the gripper it passes below and along a stationary guide bar 48 fitted below the table at such a distance from the chain 17 that the gripper comes into contact with the guide bar 48 and is thereby forced into' the position shown in full lines in Figure 5, whereupon the pawl 27 again falls into the recess in the ring 28 and secures the gripper in this position. Atthe moment in which the sheet is to be deposited (Fig. 8) the toothed wheel 29 has reached the endof the rack 31,and the rearward move ment of the platen now begins. Since the chain 17 at first reverses its direction of movej ment into the direction w, the gripper 19 which was locatedabove'the register plate 36 at the time of maximum opening of the platen.

now passeson to the upper sideof the platen and approaches the laying-on table 45. Uponthe latter thesheethas been laid in a manner to'be hereinafter described more fully, during the continuing of the earlier steps ofthe process, against marks 46 (Fig-' ure 9). At the moment of approach of the gripper 19 the laying-on table 45 is lowered by a device to be hereinafter" described, so that the gripper 19 seizes the sheet'at the edge. The pawl 22 passes over a'cam' wheel 47 (Figs. 2 and 9), which is only rotatable in the direction 1, whereby the gripper is opened and immediately closesagain, since the pawl 22 of the gripper must pass over the teeth of the wheel 47 which cannot rotate in this direction. During the closing' of the gripper the sheet'is seized. If, after this the gripper moves back in the direction 7 it is'not opened againby the camwheel 47', since the latter can turn in this direction of movement of the gripper and the'pawl 22 can thus remain in a gap between the teeth of the wheel 47 and i does not require to ride over the teeth of the wheel. At the same instant the toothed wheel 29 enters the'lower rack 32, whereby the grippers 1 8 and19 now moves in the directhesheet in the manner previouslydescribed during the return'movement of the platen.

Hence'the gripper 19 now stands in the position which the gripper 18 previously occupied; At the termination of the next insertion ofea sheet the gripper 18 again stands in this position.- a Y Y The oscillatable laying-on table 45 is secured by means of a pivot49 to a horizontal table 50, upon which thesheets are stacked. The parts 45 and 50 rest upon a frame 51,

which can travel upon balls. 52,. and has a.

projection 58, by which it can be screwed firmly to the machine frame, as shown in Fig. 12.

For the raising and lowering of the layingon table 45 there serves a bell-crank lever 54,

with a roller 55, which is oscillatable about a lower arm of the lever 54 is guided with a slot 58 upon the shaft 59 of a cam disc 60, upon the edge of which it bears, with a roller 61. 'When the roller 61 enters the notch in the cam disc, the laying-on plate sinks against the gr1ppers18 or 19. During the rest of the time the laying-on plate is raised, so that the grippers can pass through belowit.

The laying-on plate may be provided, if the laying-on is being done by hand, with a belt conveyor 62, shown in Figs. 13 and 14,

which runs over rollers 63: and 64, but this is.

not absolutely essential.

In front ofthe front edge of the laying-on 'plate45'there is a stationary rail 65, upon which hook-shaped l'aying on marks 46 are mounted. The latter are displaceable in groovest66 in the rail 65. The laying-on marks are all screwed firmly to a rail 67, which carries stops 68 at both endsabove the laying-on plate. The laying-on marks are in this manner, as shown in Fig. 16, raised during the upward swing of the laying-on plate 45 into the position shown in fulllines. When the laying-on plate 45"swings downwards, the marks 46 'fdesce'nd with it as far as the position marked a, so that the sheet Y 69 is held} fast. during. the descent of the marks. Then, when the laying-on plate descends right into its lowest position b, the

for removal by the grippers. a

marks 46 can no longer follow it, as they. remainsuspended by their bent parts upon therail 65, and the sheet is accordingly released 95 stationary pivot 56. A rod 57 pivoted to the,

' 5 efiected by laying on by means of a The method of working of the apparatus is as follows lVhile one gripper 18 or 19 during its for ward movement indicated by an arrow passes through underneath the laying-on plate 69, the latter is brought by the cam disc 60 into its raised position, so that it does not hinder the passage of the gripper (Fig. 14) After the gripper 18 or 19 has reached approximately the position shown in dotted lines in Figure 14, it reverses its direction of movement and moves in the direction of the upwardly pointing arrow against the laying-on plate. The latter is at the same time lowered by the cam disc 60 (Fig. 13), so that the grippers, which then enter notches 7 0 in the laying-on plate, can seize the sheet. The lowest position which the laying-on plate assumes under these circumstances corresponds to the position b in Figure 16, so that in this way the sheet 60, which until then was guided on the marks 68, is only released at the moment at which the grippers seize it. Immediately after the grippers have pulled the I sheet away under the marks 68 in the direction of the arrow, the laying-on plate 69 swings up again, so that the marks 46 can again arrive in front of its front edge (Fig.

14), and a new sheet 69 can be laid on. As the shape of the cam disc 60 shows, more than three-quarters of the time of one working stroke of the press is available for the laying-on.

A quicker working of the platen press is pneumatic device, as illustrated in Figures 17 and 18. In the case of this device, upon a shaft 7 3, which revolves once in the direction of the arrow during each working stroke, is mounted an eccentric disc 74, which by its rotation moves a connecting rod 7 5. The rod 75, with a lateral roller 76, runs upon the edge of the disc 74, and is lifted by the latter in the manner indicated in dotted lines. The return movement is effected by a spring 77. The rod 75 is pivoted, to an arm 78 on a shaft 7 9, so that the latter is set in reciprocatingmovement.

At the two ends of the shaft 79 are mounted double levers 80, each with one approxi mately horizontal, and one upwardly directed arm, which serve for guiding suction rod holders 81. The suction rod holder 81 on each side, which carries at the upper end the sucton rod 82, with the nozzles 83, is of angular shape and in the neighborhood of the apex thereof is pivoted by a bolt 84 to the horizontal arm of the lever 80. On its shorter arm, which engages under the arm 80, there is a positioning screw 85.

The upwardly pointing forked armof the bell-crank lever 80 carries in a slotted bearing 86 a guiding piece 87. In the latter is is pressed against the suction rod holder 81 by a spring 90 bearing at one end upon the guiding piece 87, and at the other end against a collar 89 on the pressure bolt.

The suction rod 82 slides on a stationary vertical guide 91, and therefore moves vertically upwards, with its nozzles, when it is raised by the lever 80, as far as the adjustment of the screw 85 permits. As soon as the screw 85 strikes against the arm 80, the suction rod holder 81 participates in the swinging movement of the lever 80, and the suction rod 82 then moves, with the gripped sheet of paper, upon the arcuate part of the line 82 At the end of this movement the nozzles push the sheet over a revolving feed roller 93, above which are located beating rollers 95 on oscillating levers 94.' These beating rollers descend each time, afterthe release of the sheet, and press the latter against the roller 93, whereupon it is con: veyed by the latter and by belt conveyors 97 running over rollers 96 to the laying-on mark 66, shown in Figure 16. Upon the shaft? 9, beside the double lever 80, is mounteda lever 99, to the end of whichv is pivoted a tension rod 100, which is hooked at the other end. This tension rod is pivotally connected by means of a bolt 103 with a lever, 102, which is rotatable upon a shaft 101., The tension lever 100 is intended to effect the transporting of the pilingtable together with the moving of the suction rod. The raising of the piling table 104 is efiected when a ratchet wheel 105 mounted upon a shaft 101 is fed forward by a rocking lever 106 mounted loose on the shaft 101, and a pawl 107 pivoted to the said lever, through the medium of bevel gear wheels 108 and 109 and a screw 110. The arm 106 is then driven each time by the arm 102 in its oscillating movement, if a two-armed lever 111 rotatably mounted thereon passes with one of its arms under the hook of the link rod 100. i

That'arm of the double lever 111, which is on the left-hand side'in Figure 17, is lo cated in its dotted position under a connecting rod 112, which is guided with a slot 113 on a pin 114. Above the pile of paper,

on alever 115 of a shaft 116there is a feeler.

roller 117. An arm 118 mounted on the end of the shaft 116 is pivotally connected with is pressed by the weight of the rod 112 against the cam disc 123. The latter executes one revolution during ,each working stroke of the machine The rod 112 is hereby lowered each time until the feelerroller 117 bears upon the pile of-sheets 124. So long'as the pile of sheets 124 is sufficiently high for the removal of the paper by the suctionrod, the rod 112, during the descent, only passes into the position marked 112 in w en it does not touch the double lever 1'11. -Hence'the latter remains stationary in that'one'of the two positions shown. in dotted lines, in which the hook'125 of the rod 100 passes over it during the return swing, without gripping The oscillating lever 106' thereforere-' mains in the position shown in dotted lines.

Ifhowever the pile of paper 12 1 has been so far removed that the rod 112 passes right into theposition 112 it rocks the double lever 111 into the position marked 111*, in

which it is seized by the' returning'hook 125 of the rod 100, and rocke'dinto the position spring 127 back into their original pos tions,

shown in dotted lines, in which they bear against a stop 128; 7 v Whatl claim is I 1. A platen printing press, comprising a,

platen, grippers adapted to circulateround saidplatemand means for causing said grip-- pers to move alternately a short distance 1n one direction and a longer distance in the opposite direction. 1 t i 2. A platen printing press, comprising a platen, marks onsaid platen, a laying-011 7 table, grippers adapted to circulateround said platen, andmeans for causing said grippers to move alternately a short distance in one direction and a, longer distance in the opposite direction, said grippers being adapt-,

ed during their movement in one direction totake a sheetof paper from the laying-on table and place it in the marks on the platen and during theirreturn movement to seize said sheet again and lay it down. i

3. A platen printing press, compr1sing a',

platen, a shaft, atoothed driving wheel slidably mounted onsaid' shaft and adapted to drive it, toothed chain wheels securedto said shaft, chains passing round said chain wheels, grippers arranged on said chains and adapted to circulate round the platen, a lower rail, a toothed rack on the upper surfacieo'f said lower rail, said rack occupying one side of the central part of s'aid'rail and extending across to the other side towards oneendof the rail, an'upper rail parallel to said lower rail, a toothed rack on the-under surface of said upper rail, said second rack occupying one side of the central part of said upper'rail facing the untoothed side ofthe central part of the lower rail and extending across to the other side of its rail towards the end opposite to the end at which the first toothed rack'extends across,'both ofsaid racks being'adapts ed to mesh at .difierent time with said toothed 1 driving wheel which moves between them,

:ends of the rails. I V V Y 4'. A. platen printing press, comprising a adapted to slide said driving wheel along its" shaft to transfer it from one; side ofthe racks to the other platen, grippers adapted to circulate round when it rea'ches the said platen, means for causing said grippers to movealtrnately' afshort distance in one direction and a longer distance in the op posite direction, laying-on marks, and a registerfplate,jthe grippers being adapted to .lay a sheet of paper in said laying-on marksand leave it there, 'travel to a'point outside the register plate, and return from there after the printing operation has been effected.

5Q A platenp'rinting press, comprising a;

platen, a 'rod adapted to circulate round said platen, a gripper shaft oscillatably jour- IlflLllGCl'fOlI said 'rod, grippers secured to said gripper shaft, means for causing said grippers to movealternately a short distance in onedirection and a longer distance fin the v opposite direction, and laying-on marks, said gripper shaft being adapted 'to rock away a sheet of paper that is to be laid out beyond said "laying-on marks after said sheet has been gripped,

6. A platen printingpress, comprising a platen, endless driving chains, grippers arranged on said chains and adapted to circu-j late round-the platen, and means for causing said grippers to move alternately a short dis-f tance in one direction and a longer distance in the opposite' direction, said grippers being adapted to lay down 'a sheet of'paper immediately beforethe stoppage of the movement ofthe driving chains.

" 7. A platen printingpress, comprising ai platen, grippers adapted-to circulatero'und said platen, means for causing'saidgrippers to move alternatelyta short distance in one directionand a longer distance in the opposite direction,"and alaying-on plate, said laying-on plate being adapted to swing upc Wards while the grippers pass underneath it and to sink against the grippers when said grippers move on to the laying-on plate;

8. A platen printing press, comprising a platen, grippers adapted to circulate round said platen, means for causing said grippers to move alternately a short distance in one direction and a longer distance in the opposite direction, a laying-on plate, said lay} ing-on plate beingadapted to swing upwards while the grippers pass underneath it and to sink against the grippers when'said grippers move on tothe laying-on plate, asta- I tionary rail, fixed in front of the front edge of said laying-on plate, and laying-on marks so fitted to said stationary rail that, they sink. along 5 with said laying on platejand only release the front edge thereof, with the sheet of paper lying thereon, shortlybefore f said laying-on plate reaches its' lowestgposition.

9. A platen printing press, comprising a main frame, a standard, means such as casters fitted to the bottom of said standard to facilitate displacement thereof, means for securing said standard to the main frame, a platen, grippers adapted to circulate round said platen, means for causing said grippers to move alternately-ashort distance in one direction and a longer distance in the opposite direction, a horizontal table mounted on. the standard, a laying-on plate, oscillatably mounted on said horizontal table, said laying-on plate being adapted to swing upwards while the grippers pass underneath it and to sink against the grippers when said grippers moveon to the laying-on plate, a stationary rail, fixed in front of the front edge of said laying-on plate, and laying-on marks so fitted to said stationary rail that they sinkalong with said laying-on plate and. only release the front edge thereof, with the sheet.

pivoted to said swinging, arms so as to keep said suction rod in contact with its guide during partof its oscillation. 7

1'1. A'platen printing press, comprising a platen, grippers adapted to circulate round said platen, means for causing said grippers to move alternately a short distance in one direction and a longer distance in the oppoe site direction, a horizontal table, a laying-on plate, an oscillating suction rod adapted to feed sheets of paper automatically to said laying-on plate and horizontal table, holders for said suction rod, a guide for said suction rod, and swinging arms, said holders being resiliently pivoted to said swinging arms so as to keep said suction rod in contact with its guide during part of its oscillation.

12. A platen printing press, comprising a ers for said suction rod, a guide for said suc- 1 tion rod, and swinging arms, said holders being resiliently pivoted to said swinging arms so as to keep said suction rod in contact with its guide during part of its oscillation.

13. A platen printing "press, comprising a platen, grippers adapted to circulate round said platen, means for causing said grippers to swing upwards while the grippers passx underneath it and to sink against the grippers when said grippers move on to the lay ing-0n plate, a stationary rail, fixed in front.

ofthe front edge of saidlaying-on plate, laying-on marks so fitted to said stationary rail.

that they sink along with said laying-on plate and only release the front edge thereof, with the'sheet of paper lying thereon, shortest position, an oscillating suction rod adapted to feed sheets of paper automatically to said lay-on plate and horizontal table, holders for said suction rod, a guide for said suction rod, and swinging arms, said holders being resiliently pivoted to said swinging arms so as to keep said suction rod in contact with its guide during part of its oscillation.

14. A platen printing press, comprising a main frame, a standard, means such as casters fitted to the bottom of said standard to fa cilitate displacement thereof, means for se-' curing said standard to the main frame, a

platen, grippers adapted to circulate round I L said platen, means for causing said grippers to move alternately a short distance in one directlon and a longer distance in the opposite direction, a horizontal table mounted on the standard, a laying-on plate, oscillata-bly mounted on said horizontal table, said laying-0n plate being adapted to swing upwards while the grippers pass underneath it and to sink against the grippers when said grippers move on to the laying-on plate, a stationary rail, fixed in front of the front edge of said laying-on plate, laying-on marks so fitted tosaid stationary rail that they sink along with said laying on plate and only release the front edge thereof, with the sheet of paper lying thereon, shortly before said laying-on plate reaches its lowest position, an oscillating suction rod adapted to feed sheets of paper automatically to said laying-on plate and horizontal table, holders for said suction rod, a guide for said suction rod, and swinging arms, said holders being resiliently pivoted to said swinging arms-so as to keep said suction rod in contact with its guide during part of its oscillation.

15. A platen printing press, comprising a horizontal table, a laying-on plate, an oscillating suction rod adapted to feed sheets of paper automatically to said laying-on plate and horizontal table, holders for said suction rod, a guide for said suction rod, swinging arms, said holders being pivoted to said 1y before said laying-0n platereaches its low swinging arms, resilient means interposed A -ableabutmentzadapted to limit the action 'to press said suction rod agalnst its gulde to presssaid sucti'on rod-against its. guide during part of its oscillation, and an ad ustof said resilient means so that the suction rod leaves its guide during part of its oscillation. 16. A platen printingpress, comprising a platen, grippers adapted to circulate round said platen, means for causing said grippers to move alternately a'short'distance in one.

direction and a longer'distanceintheoppositedirection, a horizontal table, a'laylng-on plate, anoscillating'suction rod adapted to feed sheetsof paper automatically to saidv laying-on plate and horizontal table,-ho'lders for said suction rod, a guide for said suction rod, swinging arms, said holders being pivoted to. said swinging arms, resilient means interposed-between said holders and said swinging arms to press said suction rod against its guide during part of its oscillation,"and an'adjustable abutment adapted to limit the action of said resilient means so that-the suction rod' leaves its guide during part of=itsoscillation.

3'17. laten-printing press, comprising a main frame, a standard, means such as casters fitted to the bottom ofsaid standard to facilitate displacement thereof, rneans for "securing said standard to the main frame, a platen, grippers adapted tocirculate round said platen, means for causing said grippers to move alternately a short distance in one di rection and alonger distance in the opposite direction, a'horizontal table mounted on'the standard, a laying-on plate, oscillatably mounted on said horizontal table, said layingon plate being adapted to swing upwards while the grippers pass underneath it andto sink against the grippers when said grippers move on to the laying-on plate, a stationary rail, fixed in front of the front edge of said laying-on plate, laying-on marks so fitted to said stationary rail that they sink along with said laying-on plate and only release the front edge thereof, with the sheet of paper. lying thereon, shortly before said laying-on plate reaches its lowest position, an oscillating suction rodad'apted to feedsheets of papera guide for said suction rod, swinging arms,

said holders beingpivoted to said swinging arms, resilient means interposedbetween said 1 holders and said swinging arms to press said suction rod against its guide during part of its oscillation, andian adjustable abutment adapted to limitthe action of said resilient means so thatthe suction rod leaves its guide during part of its oscillation.

'18. A platen printing press, comprising a horizontal table, a laying-on plate, an oscillating suction'rod adapted to feed sheets of paper automatically to said' laying-on plate and horizontal table, holders for said suction rod, a guide-forsaid suction rod, swinging swinging arms, resilient means interposed between said holders'and said swinging arms during part ofits oscillation, a table adapted to support a pile of sheets of paper, means for gradually raising said table as the'pile of sheets thereon becomes smaller, and an eccentric adapted to actuate said table and also the suction rod holders.

f 19. A platen printing press, comprising a platen, grippers adapted to circulate round said platen, means for causing said grippers to move alternately a short distance in one direction and; a longer distance in the opposite direction, a, horizontal table, a laying-on plate, an oscillating suction rod adapted to feedsheets of paper automaticallyto said laying-on plate and horizontal table,.holders for said suction rod, a guide for said suction rod,

swinging arms, said holders being pivoted to.

said swinging arms,-resilient means interposed between said holders and said swinging arms to press said suction rod againstits guide during-part of its oscillation, a table adapted to support a pile of sheets of paper,

- means for gradually raising saidtable as the pile. of sheets thereon becomes-smaller, and

an eccentric'adapted to actuate said table and also the suction rodholders.

20. A platen; printingpress, comprising;

a main frame, standard, meanssuch as casters fitted to the bottom of said standard to facilitate displacement thereof, means for securing said; standard to the main frame,

means for gradually raising said table as the pile of sheets thereon becomes smaller, a pivoted link rod, a hook atthe end of said link rod, a lever adapted to reciprocate, said link rod, a feeler device for feeling the height of the top of the pile of sheets, and a, double lever, said feeler device being adaptedto bring said link into engagement with the table raising means, by means of said'double lever, .when the top of the pile of sheets sinks below a predetermined level.

2-1. A platen printing press, comprising .a'

platen, grippers-adapted to circulateround.

said platen, meansfor causing said grippers.

to move alternately a'short distancein one direction and a longer distance in the opposite direction, a main frame, a standard, means such as casters fitted to the bottom of said standard to facilitate displacement thereof,

means'for securing said standard to the main frame, means for gradually raising said height of theltop of the pile of sheets, and a double'lever, said feeler device being adapted'tobring said link .into engagement with the table raising means,.by means of said double lever, when the top of the pile of sheets sinks below a predetermined level.

22. A platen printing press, comprising a platen, grippers adapted to circulate round said platen, means for causingsaid grippers to move alternately a short distance in one direction and a longer distance in the opposite direction, a horizontal table, a laying-on plate, an oscillating suction rod adapted to feed sheets of paper automatically to said laying-on plate and horizontal table, holders for said suction rod, a guide for said suction rod, swinging arms, said holders being pivoted to said swinging arms, resilient means interposed between said holders and said swinging arms to press said suction rod against its guide during part of its oscillation, a table adapted to support a pile of sheets of paper, means for gra'duallyraising said table as the pile of sheets thereon becomes smaller, a pivoted link rod, a hook at the end of said link rod, a lever adapted to reciprocate said link rod, a feeler device for feeling the height of the top of the pile of sheets, a double lever, said feeler device being adapted to bring said link into engage ment with the table raising means, bymeans of said double lever, when the top of the pile of sheets sinks below a predetermined level,

and an eccentric adapted to actuate saidta'ble said rails being formed with V-s'haped grooves in their upper surfaces, standards V-shaped'a-t their lower ends and adapted to run iii-said J -shaped grooves, and a platen supported by said standards.

:24. Aplaten printing press, comprising a main frame, a forme supported on said main frame rails arranged on said main frame, said rails being formed with V-shaped grooves in their upper surfaces, standards V'-' shaped at their lower ends and adapted to run in said V-shaped grooves, a platen supported by said standards, grippers adapted to circulate round said platen, and means for causing said grippers to move alternately a short distance in one direction and a longer distance in the opposite direction.

25. A platen printing press, comprising a main frame, a forme supported on said main frame rails arranged on said main frame, said rails being formed with shallow troughs in their upper surfaces, and with V-shaped grooves in the bottoms of said troughs, standards V-shaped at their lower ends and adapted to run in said V-sha'ped grooves, towards and away from said forme, said troughs forming channels for lubricating oil between the sides of the V-shaped lower ends of the standards and the margins of the troughs, and a platen supported by said standards.

264A platen printing press, comprisinga main frame, a forme supported on said main frame rails arranged on said main frame, said rails being formed with shallow troughs in their upper surfaces, andwith V-shaped grooves in the bottoms of said troughs, standards V-shaped at their lower ends and adapted to run in said V-shaped grooves,towards and away from said forme, said troughs forming channels for lubricating oil between the sides of the V-shaped lower ends of the standards and the margins of the troughs, a platen supported by said standards, grippers adapted to circulate round said platen, and means for causing said grippers to move alternately a short distance in one direction and a longer distance in the opposite direction'.

27. A platen printing press, comprising a main frame, a form'e supported on said main frame rails arranged on said main frame, said rails being formed with V-shaped grooves in their upper surfaces, standards V shaped at their lower ends andad'apted to run in said V-shaped grooves, said standards being formedwith grooves in one side, plates secured to the rails and adapted to engage with said side grooves, and means for ad'- justing the level of said plates to compensate for wear of the 'V-shaped-grooves and of the V-shaped lower ends of the standards errgaging therein, and a platen supported by said standards.

28. ,A platen printing press, comprising a main frame, a forme supported on said main frame rails arranged on said. main frame, said rails being formed with V-shaped grooves in their upper surfaces,standards V'- shaped at their lower ends and adapted to run in said V-shaped grooves, said standards being formed with grooves in one side, plates secured to the rails and adaptedto engage with said side grooves, thin sheets removably inserted between said rails and said plates to enable the level of said plates to be adjusted to compensatefor wear of the V- shaped grooves and of the- V-sh-aped lower ends of the standards engaging therein, and a plat-en supported by said standards.

29. A platen pr intingipress, comprising a main frame, a forme supported on said main frame rails arranged on said main frame, said rails being formed with shallow troughs in their upper surf-aces and with V-shaped grooves in the bottoms of saidtroughs, standards V-sha-p'ed at their lower ends and adapt ed to run in said V-shaped grooves, towards and away from said forme, said troughs forming channels for lubricating oil between the sides of the V-shaped lower ends of "the standards and the margins of the troughs,

and said plates toenable the level of said plates to be adjusted tocompensate forvvear of the V-shapedgrooves and oftheV-shaped lower ends'of the standards engaging therein, and a platen supported by said standards. p

30. A platen printing press, comprising a v H main frame, a forme supported on said main eframe rails arranged on said main frame, I

said rails being formed wlth V-shaped grooves in their upper surfaces, standards V-,

shaped at theirlower ends and adapted to run in said V-shaped' grooves, said standards being formed with grooves in one side, plates secured to the rails and adapted to 'en- .gagewith said side grooves, thin sheets removably inserted between said rails and said fplates to enable'the level of said plates to be adjusted to compensate for Wear of the'V- shaped grooves and of the-V -shaped lower I ends of the standards engaging therein, a

adapted to circulate round said platen, and

platen supported by said standards, grippers means for causing said grippers to move alternately a short distance in one direction and a longer distance in the opposite direction.

In testimony whereof I have signed my name to this'specification. V 1 v i r MAX HORA. 

